What is the formula for converting frequency to approximate wavelength in meters?

The speed of light is roughly 300,000,000 meters per second. The basic physics formula for wavelength is the speed of light divided by the frequency in Hertz. To make this math much simpler for amateur radio operators without needing a calculator for huge numbers, we can simplify the equation. By dropping the zeros, you can divide 300 by the frequency expressed in Megahertz (MHz). This shortcut directly yields the approximate wavelength in meters. Common incorrect answers either use Hertz instead of Megahertz or flip the division upside down. Always remember that the constant 300 is the number being divided, not the frequency.